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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab2f67e5886f9ca73ad78f8d9b24dfe0b8fb5ce0bf42577dd4ea5da9f1b0b6f' 
  AND token = 'UWRwCEbrjLYf7rlkN//uld5+112QyBx63HbsnDnyZmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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