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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73bdd9c1492a2c12d5b042cd9fed74bd26617597b99ac807bc135a76017bc68a' 
  AND token = 'Dh0WrfgVICcq3iu3U7v6KRcbsPOgyeBj58qTTgpFA90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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