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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '621f4f747a4536c9f959ecc318a99d04aabb757d56e4636da73be6ae801c8263' 
  AND token = 'VCQe9jlpj/UXfw3hK2p7kJM/OaIrISrRlWpbpENXvj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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