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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e74b715c65516ec02e851005498f50c1c7973d3f989e59a68d2954ee7c1c69b0' 
  AND token = 'nTMsTOq5AYo8IluTUKYIbNjCM/5vsSOe4A8/0XU/6zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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