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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13aa15483d910c15d142399ae15f5c9c97728d1c110e36001dde763b1a136f23' 
  AND token = 'cxeJeKkRTrAxBuKt6CSgtrivVOGhbZ+z1kbHoWRDhVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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