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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3688f11e4dfbe0d022d0742feb1fc93429bf05f42f1835d5e9619b22dd7ef1a' 
  AND token = 'H+vrmSW1WqFL5RO+mmSD4sQeivaC6dx99DFMrpHNtd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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