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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62505e2bb545f4a44c93643696a7c36b443691916d1f42e080d5947f931030a7' 
  AND token = '5+eC+9YmWoFFrUfnLgu4OrYGpQEJWOU1+rgT5yFvsvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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