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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c235a25a5e99e29295e72ad96444a76ccac6e6e597d1847580b8bb902128a5' 
  AND token = 'WxdDEKE5gmHETyySjlIZtKR+ErJxbmphaBQqpPRkrg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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