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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9191b6b2aa7807a8fe3d417fd00412be1213590b0ec9a83eee81d7f1b99c6072' 
  AND token = '/WQt+8C4Gq78wrgL8WhUgG6WW6nf1OkOX45VkrfqgEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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