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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb4c004df6dac30179dcc44cbe7f0fba5da04fc0178861af10b1342c300ead0' 
  AND token = 'EiPxkUnMxiq19FXDQCdFCpWDAWr+ICatgddrYb+YHBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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