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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc3478bc24c382a2864c5275e5558c1641c720bf4dea25a30cac672105f8b26' 
  AND token = 'HZUDPCtk+Sjo5Q3WUkOdQ+cTFWs7SH39FG7TqieSNGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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