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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a5ca53c783ba16c30a3f907a0f0093e076dca05a1ae4152a61bb38819f3af0d' 
  AND token = 'mLjll07MMXBdliClV9tCX5BmJKRD9nSMs3mDikDVf10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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