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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a45b8b103ed2c893946feec01af1ad6ae4b1ca1e1b6c933abf71230f1032a52' 
  AND token = 'zvtvz8u/ZMyNlb2SwxEelAG8n6ApSI7svy1y4IH03GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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