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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7772a8cfb3f17bc8c72c0df775ed5797f72e76469aec8ad21050c7273be9e7c5' 
  AND token = 'zET1AvsRnDMf+cBd/QdZHAoYYks5J/1uB8tl0M3j+CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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