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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b74f0ac2951c6eccc0731f91e5897d73e92ac073794d5a16e3f6435ecd9e1ad6' 
  AND token = 'L1ePQ4WCD47SNnU3QU5pBBuq+QetDhKmozFhN375vVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}