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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c028a73c13a14fa46be679fc79efeacd1d4a845395e9a628cd123f0b88f34491' 
  AND token = 'wa5rAS7lKx1xW5hSDi+EyE6wBO+6rj19pZtpuSds2Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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