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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7adac46e26e31f8f30fb9b082f20568e0c66cd51641e275d2fe0b7c0b30e6fed' 
  AND token = '2x/BYc8s1Re789PGb2139YBcCtIP1v0KCy4xyAsdppA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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