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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e71149c90826bf8a41adb466bbb71f65bd85279f7bfa239fac1629129f181de' 
  AND token = 'OoWPuGbcl3n582CiMAfoPRFdKNmvYP+J0rcwS7ydF4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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