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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e560643076a432f08de52492a67c698d2fdc8a5ee25ffcc3ec69080847e65336' 
  AND token = 'zIf2C73NA+aswf/uFP/ErY429vKwHb6kuMIHpKMXg4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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