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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003fc720c4372a63ce2f8b72b59d816eac39753bffc2b1af7aaa341d19624e00' 
  AND token = 'cWNoUmwhPyRbwkKiN66Adna0r7NW0mrY2vi6AVLRh5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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