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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6637a55a62506882337a9e282e8714ee3867668f6e6b495e8cc74f9a5392bf57' 
  AND token = 'GEBQyP22uRLqEB70eyqm8mnXwRfrIXUYEM4uZByG+Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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