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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3027947a202c3082c4578c40501a319cb2d4ae2572709de278abe6604ff1d0b' 
  AND token = 'nm0m/FQPa2/hGR0tS1+BYdOkdgtYvq81FNxvBVDLy9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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