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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b7fbe0653c3d43af12ae8fa26b37f2c89aa7d2bf6711b6111c710e399068a56' 
  AND token = 'd+GdJ/FxPUPV+7qm+fPdgg1k413/qs6aIfiTTpm/7ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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