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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52791baa3b4dfbc0531a538067ae2bee76e0c9857f4c7961bfdf54fa8c7b305d' 
  AND token = '8DItx1zJwjUr1YkeOXPTzYFm+xMgxbHZnawJZtt3d4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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