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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '115d4e49d7fd4756d0d1283c93ec880fd3939b84bf90949743100eaf733abe56' 
  AND token = 'mliN3HOBl6hlRidswcabeZtA7+Khmdx6I0GKP4Y8tN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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