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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72796b71dc0e447d12cc4032cf27216f7e81d884b0f2001a22833d9c7663eb73' 
  AND token = 'KDQUUDDykD1br0fpjF1YlqYvqIVESWGj7qP28odh9rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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