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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f55ba32d1670d47f3ef18a88a084770046649cd27af620c606d1553de76bb4' 
  AND token = 'DiOJUHBl01Z4fP9MDYRJORk3kP0xSNX/UaFP/H9RMKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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