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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3255ad3f80f722d99ec5254f5bc91ef0c99ec6f4f86e967baa372fb8b1b96cb8' 
  AND token = 'TNUXjNnyL0SL6mQ6cc9aMlsngOJuSWTFb/0UpOLt1l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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