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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babda69269dbb8e42db09344e69b12dbee7b89100f758acecc5fcb39030f1cdc' 
  AND token = 'D+5inE5mboa8dZuYvBHbvfnae6d1SaL0QElpYoOJXr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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