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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ec5dfba478ca3e804600edd77833c6dfab6882c9a0ecbc6990dbbfe43f1c7b' 
  AND token = 'mPYTyB04dH7DKqLMTtbw8UttDjcFoOQ2Lp1CQDmpf7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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