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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662327bd9c4855ba0819d4e98dbb073ab1a84a36bb0ab05ddacfe96c7724b53b' 
  AND token = 'npRmETkiRkxjda3Tbs+KiHhh4W2w74FYtt/aYiK7MCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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