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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7decc875fe733c21add400daf06b50d712462156527557e7ab3b01ab31c12569' 
  AND token = 'Z4k1iNZp8qmp9ZwkfDLfzc1uUqK+MiAvIDy57VA7lnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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