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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611192d9e7658ad97b86a7884d249b537c0e35e11d013fa35753dd7fce5adb6a' 
  AND token = '073RKlaZOckspsoMFbO1Rwcu6+3oHbvghet3XDHx2l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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