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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a915151a1a633f6466c7c1563c0055c81722356ef0f4303d08f409a9e141485c' 
  AND token = 'KclcUjHsrg8f5/CxE3vZ3lnpSpijUmWa3E8k8CyDH6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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