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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1142fefad8f22339a16d53f296333a099e96d0fb8570e3b55dbc9181f6c414a3' 
  AND token = 'tV6X1RUiH9HEG3x+1P/1b0fpcIsgDz7tsF0ThekS3D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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