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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b692cba69c7d713952e04ff9543fc04e08196c5c31358e3bb8d67292aaf82b' 
  AND token = 'Xln3DWHTqOyRbkI5kbxdUREVaTYWUs0FM+GBL6fMN4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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