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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4933aeac622a889927a633ad8f6ad2fa309fbe0f82b970ed80e98ea4e29bc8b9' 
  AND token = 'FOmKg006BKQ35XENavBdqtRhyuc3Scc4qcgORM3FruY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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