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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f720ff3ee0164fc2ddf74d86a031a7f2aa8a549321e9324e5b927edd2c28c34c' 
  AND token = 'lI4678sjiwALApUmhlZL7eSXCj6+VbUk1Sv8aSnYFHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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