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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da921103c4a1cf0df51b476ccb8f4bf36d372df319b969460e52f31df0ffac2' 
  AND token = 'FWs4MfK1yE5HzRulZ5oDAo8XalGUVR5q0+WRmpEQIYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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