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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc6f104168eb3f8c8e6049b7b716eeb77e38a7f120c4785e47a6714bcc456d2a' 
  AND token = '4WQKTO/sq3E3xC2uiaIAFtORGamexIMRcV861rkS8Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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