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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c4906736f9ea6f9de567e49bb2c3802a81548576e27199f3c50280df1dcbd4e' 
  AND token = 'F1IzDvhXsFeHm5SArRhXKW1Ui7crSKbyf/AsriSAsrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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