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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c1965502ff96e54cd3f0f19e04a5837b0a1cf149fb5c318fcdd4262928aa70' 
  AND token = 'rE47LboSLNjZqsVxy1MO70DxlApX/wWoANwtD9ZvoGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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