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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c1682cb1b81bf48a4d72b5a0b7322abf658ee2e929e0c7694d39a689ae4b19f' 
  AND token = 'giIggd9yIhAyLfsno9oMsAEJ4biEMIJkgEOZoSd3vAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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