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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '876698f0fefe65b7175bf201989364ee68b9e00aace232c7dab20070f489f54e' 
  AND token = '+Hv8LsGAwZrZsXas1G6tHsPO2xOJa6IP0lroPBqUL8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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