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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874dbe97b87a03a9bd37b09e0f1efbba06e3a2681cbd934e3bee8c62d9baca1b' 
  AND token = 'tko/2IbpH16AMKnOdEtdBXD/bpr+PWY9WWxFgk3B2Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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