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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85df83bb2d130dee4c5bf77f4c1c620d2e77dcfa830d83ba11c61f3267f0d847' 
  AND token = 'N91kwUQPsvD7N791UJ8bvTcyoYkw4Ihf8UuuL26ROc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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