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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079a8f5e06815cb8ff9b3ae269f553cd5bae71b504a284a554d5013ca6fd120f' 
  AND token = 'cvEy+bSQT8XGvL1tWu35kQeeLQ4nmXjfB6pdH9lfmZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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