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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0fbc28398ab9080087920cb827f158fadc9399c7df60dd3e314d6c0e3e6a398' 
  AND token = '7QSotWvDKx9cg3dnI9KYrUmgMxsiuLji24Ayif7RhT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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