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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0d7d8b1a4b3bebaae7fb9a3d9e3ab067110f0b31d165af6f3ba8e35281a5ad' 
  AND token = 'OuOHvyOUdYilM4Fl+f5Sd5rC5E2JHPM9lmsvWYZT8O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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