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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd31dc0121c2ded725b4faee39751a562a1bf93b29ffb6de50a8986d8a7d19e8d' 
  AND token = 'QRAaAy2V2X/uHemD/++81BHHWLrGVXv7UcHRca7bwlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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