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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adeb60ec8933441439a203abf18b23588a2785acb52503ae69715e86c5fcaa03' 
  AND token = 'c0JY5uAKjluSZXf8iLyth2u5q/ydh3qPFyA9RW5M60U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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