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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa05ffa14ac72bcf4c607982d5b9ae170b64ca69fd78ce6792dd32e7dfd69739' 
  AND token = 'FKc7yTbC+URbjaD5UH5nL1Dh9z/uF0X0wq3wVsvBX9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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