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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1409c3a21ef72d5309404d265e4ff0be20f2f52211642fea6c2f7d986b709a6' 
  AND token = '+WpeavCkYJDrPPXgxwUaH/dC0+zGp5g3kkdIfIR2co4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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