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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56586e7517d0f10448c4e6dea6ef90b9cae3ba8a3126dde433299a27fdbcd8ce' 
  AND token = '215x/TAF/VVIlbIPEEzCAVFqcYsXo6fRkeRn/wd5Hmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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