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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b1fe8a07099dd037a2b4f2bba93e942b9ed7230a730458cd8b4613d470f7a1' 
  AND token = 'DKpv2+j8fXtwTASeZPJ99EPI1kXM/bnAm6+1hkLx/qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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