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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17bd98279a913945dd5186e69c661d097ba4168a87e9090b2e6e415037e3b9dd' 
  AND token = '+/c0nglj6GLYLDYmYHdsdi0451q8ZCrPMpeKkBPwwtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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